对于第一次，$D^0$和$\bar{D}^0\toπ^+π^-π^+π^-$振幅之间的强相位差被确定在衰减相空间的仓中。测量使用$e^+e^-$碰撞数据的$818\,\mathrm{pb}^{-1}$，该数据在$ψ(3770)$共振处获取并由CLEO-c实验收集。测量对于确定$B^{\pm}\to D K^{\pm}$（和类似的）衰变中的$C P$破坏相$γ$是重要的，其中$D$介子（它代表$D^0$和$\bar{D}^0$的叠加）随后衰变为$π^+π^-π^+π^-$ .为了获得对$γ$的最佳灵敏度，基于最近的衰减幅度模型，将$D \to π^+π^-π^+π^-$衰减的相空间划分为仓。虽然振幅模型被用来定义的bin，所获得的测量是模型无关的。$D \to π^+π^-π^+π^-$衰变的$CP$ -偶数分数被确定为$F_{+}^{4π} = 0.769 \pm 0.021 \pm 0.010$，其中的不确定性分别是统计的和系统的。使用模拟的$B^{\pm}\to D K^{\pm}, D \to π^+π^-π^+π^-$衰变，据估计，到目前的LHC运行结束时，LHCb实验可以确定$γ$从这个衰变模式的不确定性$(\pm10\pm7)^\circ$，其中第一个不确定性是统计的基础上估计的LHCb事件的收益，第二个是由于本文中确定的参数的不确定性。
英文摘要：
For the first time, the strong phase difference between $D^0$ and $\bar{D}^0\toπ^+π^-π^+π^-$ amplitudes is determined in bins of the decay phase space. The measurement uses $818\,\mathrm{pb}^{-1}$ of $e^+e^-$ collision data that is taken at the $ψ(3770)$ resonance and collected by the CLEO-c experiment. The measurement is important for the determination of the $C P$-violating phase $γ$ in $B^{\pm}\to D K^{\pm}$ (and similar) decays , where the $D$ meson (which represents a superposition of $D^0$ and $\bar{D}^0$) subsequently decays to $π^+π^-π^+π^-$. To obtain optimal sensitivity to $γ$, the phase space of the $D \to π^+π^-π^+π^-$ decay is divided into bins based on a recent amplitude model of the decay. Although an amplitude model is used to define the bins, the measurements obtained are model-independent. The $CP$-even fraction of the $D \to π^+π^-π^+π^-$ decay is determined to be $F_{+}^{4π} = 0.769 \pm 0.021 \pm 0.010$, where the uncertainties are statistical and systematic, respectively. Using simulated $B^{\pm}\to D K^{\pm}, D \to π^+π^-π^+π^-$ decays, it is estimated that by the end of the current LHC run, the LHCb experiment could determine $γ$ from this decay mode with an uncertainty of $(\pm10\pm7)^\circ$, where the first uncertainty is statistical based on estimated LHCb event yields, and the second is due to the uncertainties on the parameters determined in this paper.
Improved determination of the $D \to K^-π^+π^+π^-$ coherence factor and associated hadronic parameters from a combination of $e^+e^-\to ψ(3770)\to c\bar{c}$ and $pp \to c \bar{c} X$ data
Direct measurement of the absolute branching fraction for $D^+ \to {\bar K}^0μ^+ν_μ$ and determination of $ Γ(D^0 \to K^-μ^+ν_μ)/Γ(D^+ \to {\bar K}^0μ^+ν_μ)$
Direct Measurement of the Branching Fraction for the Decay of $D^+ \to \bar K^0 e^+ν_e$ and Determination of $Γ(D^0 \to K^-e^+ν_e)/ Γ(D^+ \to \bar K^0 e^+ν_e)$
Measurement of inclusive $D_s$, $D^0$, and $J/ψ$ rates and determination of the $B_s^{(*)} \bar{B}_s^{(*)}$ production fraction in $b \bar{b}$ events at the Y(5S) resonance
Measurement of the inclusive $t\bar{t}$ production cross section in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV and determination of the top quark pole mass
Measurements of the absolute branching fractions for D->Kbar pi e+ nu_e, D-> K*bar e+nu_e and determination of Gamma(D+ -> K*0bar e+ nu_e)/Gamma(D+ -> K0bar e+nu_e)
We carry out an analysis of the full set of ten $\bar{B}\to D^{(*)}$ form factors within the framework of the Heavy-Quark Expansion (HQE) to order $\mathcal{O}(α_s,\,1/m_b,\,1/m_c^2)$, both with and without the use of experimental data. This becomes possible due to a recent calculation of these form factors at and beyond the maximal physical recoil using QCD light-cone sum rules, in combination with constraints from lattice QCD, QCD three-point sum rules and unitarity. We find good agreement amongst the various theoretical results, as well as between the theoretical results and the kinematical…
We perform a helicity amplitude analysis for the processes of $e^+e^-$$\rightarrow$$J/ψ,ψ(2S)\rightarrowΞ(1530)\barΞ(1530)\rightarrowππΞ\barΞ\rightarrowΛ\bar\Lambda4π\rightarrow p\bar{p}6π$. The joint angular distribution for these processes are obtained, which allows a proper estimation of the detection efficiency using helicity amplitude information. In addition, the sensitivities of measurement of hyperon asymmetry decay parameters for these processes are discussed.
Testing QCD factorization with phase determinations in $B\to Kπ$,$Kρ$ and $ K^{*}π$ decays
成功的QCD因子分解（QCDF）在预测的分支比的无粲$B$衰变到轻赝标和矢量介子和小CP不对称性测量$BABAR$，Belle和LHCb表明，在这些衰变的阶段，如QCDF预测的，是不大的。对于QCDF的精确测试，需要从测量的衰减率中提取出现在树和企鹅贡献之间的干扰项中的衰减幅度的相位。由于树振幅在$Λ_{\rm QCD}/m_{b}$中的前导阶处是已知的，并且与测量的树主导衰减速率一致，因此树振幅的QCDF值可以与测量的衰减速率一起使用，以获得$B\to Kπ$、$Kρ$和$ K^{*}π$衰减速率中的相位。这类似于先前完成的在$p\bar{p}\to J/Ψ\to e^{+}e^{-}$和$p\bar{p}\to e^{+}e^{-} $之间的干扰项中以及在$J/Ψ\to 0^{-}0^{-}$中的最终状态相互作用相位的提取。本文利用测量的$B\to Kπ$、$Kρ$和$ K^{*}π$衰变的衰变率和从$I=2$ $B^{+}\to π^{+}π^{0},ρ^{0}π^{+}, ρ^{+}π^{0 tree-dominated decays and compare the result with the phase given by QCDF. It is remarkable that the phase extracted from experiments differs o…
While the standard model is the most successfully theory to describe all interactions and constituents in elementary particle physics, it has been constantly examined for over four decades. Weak decays of charm quarks can measure the coupling strength of quarks in different families and serve as an ideal probe for CP violation. As the lowest charm-strange baryons with three different flavors, $Ξ_c$ baryons (made of $csu$ or $csd$) have been extensively studied in experiments at the large hadron collider and in electron-positron collision. However the lack of reliable knowledge in theory become…
We have derived the tensor amplitudes for partial wave analysis of $ψ\toΔ\barΔ$, $Δ\to p π$ within the helicity frame, as well as the amplitudes for the other decay sequences with same final states. These formulae are practical for the experiments measuring $ψ$ decaying into $p \bar{p}π^+ π^-$ final states, such as BESIII with its recently collected huge $J/ψ$ and $ψ(2S)$ data samples.
